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From 1957 to 1990 Campbell worked at Merck Institute for Therapeutic Research, [8] and from 1984 to 1990 he was a Senior Scientist and Director with Assay Research and Development. He became a US citizen in 1964. [9] One of his discoveries while at Merck was the fungicide thiabendazole, used to treat potato blight, historically a scourge of ...
Images of embryos provide a means of comparing embryos of different ages, and species. To this day, embryo drawings are made in undergraduate developmental biology lessons. Comparing different embryonic stages of different animals is a tool that can be used to infer relationships between species, and thus biological evolution .
[8] [9] Many plants are well known for natural cloning ability, including blueberry plants, Hazel trees, the Pando trees, [10] [11] the Kentucky coffeetree, Myrica, and the American sweetgum. It also occurs accidentally in the case of identical twins, which are formed when a fertilized egg splits, creating two or more embryos that carry ...
The first formulation of the phylotypic period concept came in 1960 from Friedrich Seidel's Körpergrundgestalt, [5] which translates to “basic body shape.” In 1977, Cohen defined the phyletic stage as the first stage that reveals the general characters shared by all members of that phylum. [6]
Biology is the scientific study of life. [ 1 ] [ 2 ] [ 3 ] It is a natural science with a broad scope but has several unifying themes that tie it together as a single, coherent field. [ 1 ] [ 2 ] [ 3 ] For instance, all organisms are composed of at least one cell that processes hereditary information encoded in genes , which can be transmitted ...
Cell Biology in "The Biology Project" of University of Arizona. Centre of the Cell online; The Image & Video Library of The American Society for Cell Biology Archived 2011-06-10 at the Wayback Machine, a collection of peer-reviewed still images, video clips and digital books that illustrate the structure, function and biology of the cell.
Genetic divergence is the process in which two or more populations of an ancestral species accumulate independent genetic changes through time, often leading to reproductive isolation and continued mutation even after the populations have become reproductively isolated for some period of time, as there is not any genetic exchange anymore. [1]
A chordate (/ ˈ k ɔːr d eɪ t / KOR-dayt) is a deuterostomal bilaterian animal belonging to the phylum Chordata (/ k ɔːr ˈ d eɪ t ə / kor-DAY-tə).All chordates possess, at some point during their larval or adult stages, five distinctive physical characteristics (synapomorphies) that distinguish them from other taxa.